Final answer:
In the book Rain Reign, the first instruction Rose gives on how to look for a lost dog is to set a perimeter around the area where the dog was last seen.
Step-by-step explanation:
In the book Rain Reign, the first instruction Rose gives on how to look for a lost dog is to set a perimeter around the area where the dog was last seen. This involves marking the boundaries with objects or landmarks to create a search zone. By searching within this defined area, it increases the chances of finding the lost dog.